MailboxValidator vs ZeroBounce
MailboxValidator
mailboxvalidator.com
ZeroBounce
zerobounce.netSide by side
| Figure | MailboxValidator | ZeroBounce |
|---|---|---|
| Price from | Free | $6.58/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 10 | 7 |
| Spec score · Email Verification APIs | 7.9 (#12) | 8.6 (#1) |
| Spec score · Email Verification Services | 7.9 (#19) | 8.6 (#4) |
| Headquarters | Penang, Malaysia | Santa Barbara, California, United States |
| Integrations | Listed integrations include Zapier, Make, MailChimp, AWeber, Mailgun, SendGrid, Campaign Monitor, SparkPost, HubSpot, MailerLite, Constant Contact, VerticalResponse, MooSend, Mailjet, iContact, ActiveCampaign, Intercom, Autopilot, ChatGPT, and MCP. | The platform lists integrations for CRMs, marketing systems, forms, spreadsheets, ecommerce, and automation services including HubSpot, Salesforce, Mailchimp, Zapier, Google Sheets, and Shopify. |
| Purpose | MailboxValidator checks email addresses and mailboxes to identify invalid addresses and help reduce email bounces. | ZeroBounce verifies email addresses, cleans lists, builds sender reputation, and monitors inbox health. |
| Security | Hexasoft says it maintains technical, administrative, and physical measures reasonably designed to help protect personal data from unauthorized processing. | The company lists SOC 2 Type 2, ISO/IEC 27001:2022, HIPAA, GDPR, CCPA/CPRA, and PCI DSS among its certifications or compliance claims. |
| Support | The privacy policy lists [email protected] and says to allow up to four weeks for a reply to privacy inquiries. | The company advertises 24/7 support and lists VIP 24/7 support as a ZeroBounce ONE benefit. |
Plans
MailboxValidator
- API-FREEFree
- API-FREE+Free
- BULK-TRIALFree
- BULK-1$19.95, paid once
- BULK-5$39.95, paid once
- BULK-10$59.95, paid once
- BULK-50$149.95, paid once
- BULK-100$199.95, paid once
- BULK-500$399.95, paid once
- BULK-1000$699.95, paid once
ZeroBounce
- FreeFree
- Pay-as-you-go$39, paid once
- Pay-As-You-Go$39, paid once
- ZeroBounce ONE annual$79 a year
- ZeroBounce ONE monthly$99 a month
- ZeroBounce ONE™$99 a month
- EnterprisePriced on request
In their own words
MailboxValidator
MailboxValidator checks email addresses and mailboxes to flag invalid addresses and help reduce email bounces. It is available on the web and through an API, with single-address results returned as JSON or XML. For lists, users can upload text or CSV files for bulk validation. Checks cover syntax, MX records, SMTP responses, greylisting, disposable and free-provider addresses, role addresses, suppression, DMARC, strict SPF, and website reachability. The company says it tests the connection through the SMTP server without sending a message to the recipient. Listed integrations include Zapier, Make, MailChimp, Mailgun, SendGrid, HubSpot, and others; API documentation links libraries for Node.js, Ruby, PHP, Perl, Python, Java,.NET, Go, and Rust. The free API plan is free, billed per month, with 300 queries and 30-day validity. A bulk trial is free for 100 queries and 30-day validity. Yahoo validations are unsupported, and non-ASCII addresses are marked invalid syntax. The FAQ says refunds are not offered; its privacy policy says processed personal data is retained indefinitely, subject to policy limits on deletion requests.
ZeroBounce
ZeroBounce verifies email addresses, cleans lists, and provides tools for sender reputation and inbox health. Validation is offered for bulk files and through a real-time API; the company claims 99.6% accuracy. Deliverability features include email warmup, inbox placement and server testing, blacklist and DMARC monitoring, and a dashboard. AI Email Scoring ranks addresses from 1 to 10, while Email Finder looks for professional addresses using a name and company domain. ZeroBounce lists more than 40 integrations and also supports API, SDK, and Zapier connections. An iOS app is available for list cleaning. The company says uploaded files are encrypted after TLS upload and deleted within 30 days, and that it operates its own data center and hardware rather than storing customer data on public cloud providers. A business account gets 100 free verifications per month. Pay-As-You-Go costs $39, paid once for 2,000 validations; ZeroBounce ONE costs $99 a month.